Question

Let be a sequence such that a1+a2+....+ an=$\frac{n^2+3n}{ (n+1 ) (n+2)}$. If $28∑^{10}_{k=1}\frac{1}{a_k} =$ P1P2P3 . . . Pm , where p1, p2, …..pm are the first m prime numbers, then m is equal to

• A. 5
• B. 6
• C. 7
• D. 8

Answer 1

Answer: (B)

6

Answer 2

The correct option is(B): 6